CN110247372A - A kind of classification controlled reactor control winding inter-turn protection method based on zero sequence impedance - Google Patents
A kind of classification controlled reactor control winding inter-turn protection method based on zero sequence impedance Download PDFInfo
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- CN110247372A CN110247372A CN201910613805.6A CN201910613805A CN110247372A CN 110247372 A CN110247372 A CN 110247372A CN 201910613805 A CN201910613805 A CN 201910613805A CN 110247372 A CN110247372 A CN 110247372A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/008—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for protective arrangements according to this subclass
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Abstract
The invention discloses a kind of classification controlled reactor control winding inter-turn protection method based on zero sequence impedance, comprises the following processes: calculating zero-sequence current and residual voltage according to the three-phase current of the classification controlled reactor control winding got and three-phase voltage；Zero sequence, which is calculated, according to the zero-sequence current and the residual voltage measures impedance；The amplitude of impedance is measured according to zero sequence and phase judges that current turn-to-turn fault belongs to troubles inside the sample space or external area error, and trigger protection acts if belonging to troubles inside the sample space, and otherwise trigger protection does not act.The invention has the benefit that the size and Orientation by control winding zero sequence impedance reliably can sensitively judge external area error in area; and the principle fixed value adjusting is simple and reliable; the influence of uncontrolled coil volume variation; the sensitivity and reliability that protection can be improved, can be widely applied in the reactor protection of the gradable adjusting of capacity.
Description
Technical field
The invention belongs to electric system winding protection technical fields, and in particular to a kind of classification based on zero sequence impedance is controllable
Reactor control winding inter-turn protection method.
Background technique
The effect of shunt reactor restricted overvoltage and reactive compensation, shunt reactor have fixed capacity reactor and appearance
Measure controllable reactor, fixed capacity reactor capacity is non-adjustable, can not system for tracking demand carry out capacity regulating, classification is controllable
Reactor capacity is adjustable to can satisfy the demand that system adjusts idle dynamic, therefore is mostly used in high-pressure system, therefore in parallel
The stable operation of reactor is critically important to power grid, and the reliability protected to it also has higher requirement, but currently as classification
The interturn protection principle of controlled reactor control winding is the control winding zero sequence mistake being latched through reactor high-pressure side residual voltage
Protection philosophy is flowed, the principle is more demanding to fixed value adjusting, it is desirable that residual voltage is latched definite value and control winding zero sequence overcurrent is fixed
Value will have reasonable matching relationship, and the capacity for being classified controlled reactor control winding is dynamic change, so that failure is electric
Stream is different under different capabilities, this fixed value adjusting brings very big difficulty, if adjusting definite value mismatch, protection will
There is tripping or malfunction, leads to not reliably protect control winding, will affect entire electric system when serious
Safe and stable operation.
In the prior art, the turn-to-turn that controlled reactor control winding is classified in the reactor protection device used in engineering is protected
Shield principle can not identify the change of control winding capacity, while fixed value adjusting is more difficult, without a kind of protection reliability and spirit
The quick uncontrolled coil volume of property changes and fixed value adjusting is relatively easy to guard method.Therefore it provides one kind can be protected reliably
The method of shield winding seems particularly important.
Summary of the invention
It is an object of the invention to overcome deficiency in the prior art, a kind of classification controllable electric based on zero sequence impedance is provided
Anti- device control winding inter-turn protection method, fixed value adjusting process is simple and reliable, and the influence of uncontrolled coil volume variation,
Can be improved protection sensitivity and reliability and can to classification controlled reactor control winding reliably be protected.
To solve prior art problem, the classification controlled reactor control that the invention discloses a kind of based on zero sequence impedance around
Group inter-turn protection method,
It comprises the following processes:
According to get classification controlled reactor control winding three-phase current and three-phase voltage calculate zero-sequence current and
Residual voltage；
Zero sequence, which is calculated, according to the zero-sequence current and the residual voltage measures impedance；
The amplitude of impedance is measured according to zero sequence and phase judges that current turn-to-turn fault belongs to troubles inside the sample space or external area error,
Trigger protection acts if belonging to troubles inside the sample space, and otherwise trigger protection does not act.
Further,
The three-phase current and three-phase voltage for the classification controlled reactor control winding that the basis is got calculate zero sequence electricity
The process of stream and residual voltage are as follows:
According to formulaThe zero-sequence current is calculated,Respectively it is classified controllable electric
Anti- device control winding three-phase fundamental current；
According to formulaThe residual voltage is calculated,Respectively classification can
Control reactor control winding three-phase fundamental voltage.
Further,
The process that zero sequence measurement impedance is calculated according to the zero-sequence current and the residual voltage are as follows:
According to formulaThe zero sequence measurement impedance is calculated,Impedance is measured for zero sequence,WithRespectively it is classified controlled reactor control winding zero sequence fundamental current and voltage.
Further,
It is described that the process for belonging to area's internal and external fault is judged whether according to the amplitude and phase of zero sequence measurement impedance are as follows:
If meeting formulaIt is then judged to troubles inside the sample space, is otherwise judged to
External area error；Impedance is adjusted for positive direction,Reversely to adjust impedance.
Further,
When turn-to-turn fault occurs,Value is 0.5Zc,Value is 2Zk, ZkFor classification controlled reactor leakage
It is anti-, ZcControl winding impedance when being run for classification controlled reactor maximum capacity.
Further,
If current turn-to-turn fault belongs to troubles inside the sample space, and does not occur CT broken string and PT broken string currently, then trigger protection acts.
Further,
The current process that CT broken string occurs of judgement are as follows:
Judge that the current CT that occurs breaks if meeting following condition simultaneously, CT broken string otherwise do not occur currently:
Current zero-sequence current value is greater than the set value I1,
Current broken string phase no current,
The current broken string relatively upper period decreasing value of phase current is more than setting value Δ I,
Current broken string phase difference current is greater than the set value I2,
The absolute value of the changing value in a current residual voltage relatively upper period is not more than setting value Δ U.
Further,
The setting value I1=0.15In, InFor reactor rated current；The setting value Δ I=40mA, the setting value
I2=0.15In, the setting value Δ U=3V.
Further,
The current process that PT broken string occurs of judgement are as follows:
Current generation PT broken string is judged if meeting at least one following condition, and PT broken string does not otherwise occur currently:
Current residual voltage is greater than the set value U1,
Any one phase voltage is less than setting value U2。
Further,
The setting value U1=20V, the setting value U2=8V.
The invention has the benefit that the size and Orientation by control winding zero sequence impedance can be reliably sensitive
Judge external area error in area, and the principle fixed value adjusting is simple and reliable, the influence of uncontrolled coil volume variation, Ke Yiti
The sensitivity and reliability of height protection, can be widely applied in the reactor protection of the gradable adjusting of capacity.
Detailed description of the invention
Fig. 1 is classification controlled reactor mutual inductor configuration diagram, and TA1 is current transformer, and TV1 is voltage transformer；
Fig. 2 is control winding interturn protection operating space figure, Zset1For non-action area, Zset2For active region；
Fig. 3 is control winding turn-to-turn fault equivalent circuit diagram, Zs0For system zero sequence impedance, ZkFor classification controlled reactor leakage
It is anti-, ZM0To be classified controlled reactor excitation impedance, ZcControl winding impedance when being run for classification controlled reactor maximum capacity,
Zf0To be classified controlled reactor control winding fault impedance, Uf0To be classified controlled reactor control winding fault point residual voltage；
Fig. 4 is zero sequence impedance interturn protection logic chart；
Fig. 5 is that CT broken string differentiates logic chart；
Fig. 6 is that PT broken string differentiates logic chart.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and not intended to limit the protection scope of the present invention.
As shown in Figures 1 to 6, a kind of classification controlled reactor control winding inter-turn protection method based on zero sequence impedance, packet
Include following process:
Step 1: according to the three-phase current of the classification controlled reactor control winding gotAnd three-phase
VoltageCalculate separately zero-sequence currentAnd residual voltageZero-sequence currentCalculation formula are as follows:
Residual voltageCalculation formula are as follows:
Step 2: according to the zero-sequence currentWith the residual voltageIt calculates zero sequence and measures impedanceZero sequence
Measure impedanceCalculation formula are as follows:
Step 3: the amplitude of impedance being measured according to zero sequence and phase judges that current turn-to-turn fault belongs to troubles inside the sample space or area
Outer failure, trigger protection acts if belonging to troubles inside the sample space, and otherwise trigger protection does not act.It is described that impedance is measured according to zero sequence
Amplitude and phase judge whether the process for belonging to area's internal and external fault are as follows:
If meeting formulaIt is then judged to troubles inside the sample space, is otherwise judged to
External area error；Impedance is adjusted for positive direction,Reversely to adjust impedance.
As shown in figure 3, current transformer polar end is directed toward low-pressure side bus, and when turn-to-turn fault occurs, zero sequence measurement resistance
It is anti-are as follows: Zm0=(Zs0+Zk)/ZM0, angle is close to -90 °, since system zero sequence impedance is smaller, Zm0< 2Zk, therefore
Value is 2Zk, control winding exit failure, zero sequence impedance are protected using offset circle, as shown in Fig. 2, wherein Z in order to preventset1
Desirable 0.5Zc, in this way protection exit failure can action message, when external area error is reliably motionless.ZkTo be classified controllable reactance
Device leakage reactance, ZcControl winding impedance when being run for classification controlled reactor maximum capacity.
In step 3, false protection when breaking in order to avoid current transformer TA1, zero sequence impedance interturn protection increases
CT breakage lock device logic, CT broken string differentiate logic as shown in figure 5, and also to when voltage transformer TV1 being avoided to break
False protection, zero sequence impedance interturn protection increase PT breakage lock device logic, and PT broken string differentiates that logic as shown in Fig. 6, improves guarantor
The practicability and reliability of logic are protected, specific relay protective scheme is as shown in Figure 4.Specifically, if current turn-to-turn fault belongs to event in area
Barrier, and CT broken string and PT broken string does not occur currently, then trigger protection acts.
The current process that CT broken string occurs of judgement are as follows:
Judge that the current CT that occurs breaks if meeting following condition simultaneously, CT broken string otherwise do not occur currently:
Current zero-sequence current value is greater than the set value I1, I1=0.15In, InFor reactor rated current；
Current broken string phase no current；
The current broken string relatively upper period decreasing value of phase current is more than setting value Δ I, Δ I=40mA；
Current broken string phase difference current is greater than the set value I2, I2=0.15In；
The absolute value of the changing value in a current residual voltage relatively upper period is not more than setting value Δ U, Δ U=3V.
The current process that PT broken string occurs of judgement are as follows:
Current generation PT broken string is judged if meeting at least one following condition, and PT broken string does not otherwise occur currently:
Current residual voltage is greater than the set value U1, U1=20V；
Any one phase voltage is less than setting value U2, U2=8V.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of classification controlled reactor control winding inter-turn protection method based on zero sequence impedance, it is characterised in that:
It comprises the following processes:
Zero-sequence current and zero sequence are calculated according to the three-phase current of the classification controlled reactor control winding got and three-phase voltage
Voltage；
Zero sequence, which is calculated, according to the zero-sequence current and the residual voltage measures impedance；
The amplitude of impedance is measured according to zero sequence and phase judges that current turn-to-turn fault belongs to troubles inside the sample space or external area error, if belonging to
In troubles inside the sample space, then trigger protection is acted, and otherwise trigger protection does not act.
2. a kind of classification controlled reactor control winding interturn protection side based on zero sequence impedance according to claim 1
Method, it is characterised in that:
The basis get classification controlled reactor control winding three-phase current and three-phase voltage calculate zero-sequence current and
The process of residual voltage are as follows:
According to formulaThe zero-sequence current is calculated,Respectively it is classified controlled reactor
Control winding three-phase fundamental current；
According to formulaThe residual voltage is calculated,Respectively it is classified controllable electric
Anti- device control winding three-phase fundamental voltage.
3. a kind of classification controlled reactor control winding interturn protection side based on zero sequence impedance according to claim 2
Method, it is characterised in that:
The process that zero sequence measurement impedance is calculated according to zero-sequence current and the residual voltage are as follows:
According to formulaThe zero sequence measurement impedance is calculated,Impedance is measured for zero sequence,WithPoint
Controlled reactor control winding zero sequence fundamental current and voltage Wei be classified.
4. a kind of classification controlled reactor control winding interturn protection side based on zero sequence impedance according to claim 3
Method, it is characterised in that:
It is described that the process for belonging to area's internal and external fault is judged whether according to the amplitude and phase of zero sequence measurement impedance are as follows:
If meeting formulaIt is then judged to troubles inside the sample space, is otherwise judged to outside area
Failure；Impedance is adjusted for positive direction,Reversely to adjust impedance.
5. a kind of classification controlled reactor control winding interturn protection side based on zero sequence impedance according to claim 4
Method, it is characterised in that:
When turn-to-turn fault occurs,Value is 0.5Zc,Value is 2Zk, ZkTo be classified controlled reactor leakage reactance, Zc
Control winding impedance when being run for classification controlled reactor maximum capacity.
6. a kind of classification controlled reactor control winding turn-to-turn based on zero sequence impedance according to any one of claims 1 to 5
Guard method, it is characterised in that:
If current turn-to-turn fault belongs to troubles inside the sample space, and does not occur CT broken string and PT broken string currently, then trigger protection acts.
7. a kind of classification controlled reactor control winding interturn protection side based on zero sequence impedance according to claim 6
Method, it is characterised in that:
The current process that CT broken string occurs of judgement are as follows:
Judge that the current CT that occurs breaks if meeting following condition simultaneously, CT broken string otherwise do not occur currently:
Current zero-sequence current value is greater than the set value I1,
Current broken string phase no current,
The current broken string relatively upper period decreasing value of phase current is more than setting value Δ I,
Current broken string phase difference current is greater than the set value I2,
The absolute value of the changing value in a current residual voltage relatively upper period is not more than setting value Δ U.
8. a kind of classification controlled reactor control winding interturn protection side based on zero sequence impedance according to claim 7
Method, it is characterised in that:
The setting value I1=0.15In, InFor reactor rated current；The setting value Δ I=40mA, the setting value I2=
0.15In, the setting value Δ U=3V.
9. a kind of classification controlled reactor control winding interturn protection side based on zero sequence impedance according to claim 6
Method, it is characterised in that:
The current process that PT broken string occurs of judgement are as follows:
Current generation PT broken string is judged if meeting at least one following condition, and PT broken string does not otherwise occur currently:
Current residual voltage is greater than the set value U1,
Any one phase voltage is less than setting value U2。
10. a kind of classification controlled reactor control winding interturn protection side based on zero sequence impedance according to claim 9
Method, it is characterised in that:
The setting value U1=20V, the setting value U2=8V.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910613805.6A CN110247372B (en) | 2019-07-09 | 2019-07-09 | Zero-sequence impedance-based method for controlling inter-turn protection of winding by using hierarchical controllable reactor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910613805.6A CN110247372B (en) | 2019-07-09 | 2019-07-09 | Zero-sequence impedance-based method for controlling inter-turn protection of winding by using hierarchical controllable reactor |
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| CN110247372A true CN110247372A (en) | 2019-09-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111562516A (en) * | 2020-05-27 | 2020-08-21 | 南方电网科学研究院有限责任公司 | Method, system and equipment for judging power supply fault based on sequence mutation impedance |
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| CN104078932A (en) * | 2014-07-09 | 2014-10-01 | 国家电网公司 | Control winding interturn protection method for controllable electric reactor |
| CN105186469A (en) * | 2015-08-27 | 2015-12-23 | 南京国电南自电网自动化有限公司 | Variance-based zero-sequence over-current inter-turn protection method for graded controllable reactors |
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| CN104078932A (en) * | 2014-07-09 | 2014-10-01 | 国家电网公司 | Control winding interturn protection method for controllable electric reactor |
| CN105186469A (en) * | 2015-08-27 | 2015-12-23 | 南京国电南自电网自动化有限公司 | Variance-based zero-sequence over-current inter-turn protection method for graded controllable reactors |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111562516A (en) * | 2020-05-27 | 2020-08-21 | 南方电网科学研究院有限责任公司 | Method, system and equipment for judging power supply fault based on sequence mutation impedance |
| CN111562516B (en) * | 2020-05-27 | 2023-05-23 | 南方电网科学研究院有限责任公司 | Power failure discriminating method, system and equipment based on sequence mutation quantity impedance |
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